package com.zrl.web;


import com.zrl.pojo.Book;
import com.zrl.pojo.Page;
import com.zrl.service.BookService;
import com.zrl.service.impl.BookServiceImpl;
import com.zrl.utils.WebUtils;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

public class BookServlet extends BaseServlet {

    private BookService bookService = new BookServiceImpl();

    protected void add(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        int pageNo = WebUtils.parseInt(req.getParameter("pageNo"),0);
        pageNo+=1;
        Book book = WebUtils.copyParamToBean(req.getParameterMap(),new Book());
        bookService.addBook(book);
//        req.getRequestDispatcher("/manager/bookServlet?action=list").forward(req,resp);
        resp.sendRedirect(req.getContextPath() + "/manager/bookServlet?action=page&pageNo=" + pageNo);
    }

    protected void delete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//      String id = req.getParameter("id");
//        int i = 0;
//        try {
//            i = Integer.parseInt(id);
//        } catch (NumberFormatException e) {
//            e.printStackTrace();
//        }
        //获取请求参数
        int id = WebUtils.parseInt(req.getParameter("id"),0);
        bookService.deleteBookById(id);
        //重定向回图书管理页面
        resp.sendRedirect(req.getContextPath() + "/manager/bookServlet?action=page&pageNo=" + req.getParameter("pageNo"));
    }

    protected void update(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //获取请求的参数对象==封装成Book对象
        Book book = WebUtils.copyParamToBean(req.getParameterMap(), new Book());
        //调用bookService.updateBook(book);修改图书
        bookService.updateBook(book);
        //重定向回图书管理页面
        resp.sendRedirect(req.getContextPath() + "/manager/bookServlet?action=page&pageNo=" + req.getParameter("pageNo"));


    }
    protected void page(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1,获取请求的参数pageNo，pageSize
        int pageNo = WebUtils.parseInt(req.getParameter("pageNo"),1);
        int pageSize = WebUtils.parseInt(req.getParameter("pageSize"), Page.PAGE_SIZE);
        //2,调用BookService.page(pageNo,pageSize):page对象
        Page<Book> page = bookService.page(pageNo,pageSize);
        page.setUrl("manager/bookServlet?action=page");
        //3,保存page对象到request域中
        req.setAttribute("page",page);
        //4,请求转发到pages/manager/book_manager.jsp页面
        req.getRequestDispatcher("/pages/manager/book_manager.jsp").forward(req,resp);
    }

    protected void getBook(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1,获取请求的参数图书编号
        int id = WebUtils.parseInt(req.getParameter("id"),0);
        //2,调用bookService.queryBookById查询图书
        Book book = bookService.queryBookById(id);
        //3,保存图书到request域中
        req.setAttribute("book",book);
        //4,请求转发到 pages/manager/book_edit.jsp
        req.getRequestDispatcher("/pages/manager/book_edit.jsp").forward(req,resp);
    }

    protected void list(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1,通过BookService查询全部图书
        List<Book> books = bookService.queryBooks();
        //2,把全部图书保存到request域中
        req.setAttribute("books",books);
        //3,请求转发到/pages/manager/book_manager.jsp页面
        req.getRequestDispatcher("/pages/manager/book_manager.jsp").forward(req,resp);
    }

}
